heat map objective function?

PaterMaximus

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I generate several Z heat maps (X,Y, Z=performance) by varying the X and Y functions. I want to pick the best X,Y functions based on the heat maps.

A heat map with a smoother surface is better than a rough one. Also, one that separates high performance from low performance is paramount.

Any ideas on how to algorithmicly use these two(or more) criteria to pick the "best" heat map?
 
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